I see these two IPv4 networks
10.250.251.242/22 brd 10.250.251.255
10.50.235.12/24 brd 10.50.235.255

Assuming you want to reach 10.50.235.200 for DNS, do you have that address setup as a DNS server?

Also, if you have multiple DNS server setup, it will use the first one until it fails, then it will failover to #2 in the list, etc. so you can't simply list multiple DNS server and expect them all to be used.

I see these two IPv4 networks
10.250.251.242/22 brd 10.250.251.255
10.50.235.12/24 brd 10.50.235.255

Assuming you want to reach 10.50.235.200 for DNS, do you have that address setup as a DNS server?

Also, if you have multiple DNS server setup, it will use the first one until it fails, then it will failover to #2 in the list, etc. so you can't simply list multiple DNS server and expect them all to be used.

Can you ping the IP of the client you want to connect to by IP?

DNS server is at 10.50.235.235
Yes, I can ping the DNS Server and the clients on the 10.50 network by IP address but not by name.
If I disable the 10.250 network, then I can ping & reach the clients by name.

I see these two IPv4 networks
10.250.251.242/22 brd 10.250.251.255
10.50.235.12/24 brd 10.50.235.255

Assuming you want to reach 10.50.235.200 for DNS, do you have that address setup as a DNS server?

Also, if you have multiple DNS server setup, it will use the first one until it fails, then it will failover to #2 in the list, etc. so you can't simply list multiple DNS server and expect them all to be used.

Can you ping the IP of the client you want to connect to by IP?

DNS server is at 10.50.235.235
Yes, I can ping the DNS Server and the clients on the 10.50 network by IP address but not by name.
If I disable the 10.250 network, then I can ping & reach the clients by name.

Does 250.254 have 235.235 in its upstream list or have a secondary zone for 235.x?

No, 250.254 doesn't have a DNS server, just services provided by the dhcp router.

I am confused. Either way, does the DNS server in the subnet where your DNS service is working have the DNS server for the non functioning subnet in its upstream list or a secondary zone for that subnet?

Does 250.254 have 235.235 in its upstream list or have a secondary zone for 235.x?

No, 250.254 doesn't have a DNS server, just services provided by the dhcp router.

I am confused. Either way, does the DNS server in the subnet where your DNS service is working have the DNS server for the non functioning subnet in its upstream list or a secondary zone for that subnet?

250.254 is my Meraki router (so no "standalone" DNS server)
Not sure if I can add a secondary zone

Does 250.254 have 235.235 in its upstream list or have a secondary zone for 235.x?

No, 250.254 doesn't have a DNS server, just services provided by the dhcp router.

I am confused. Either way, does the DNS server in the subnet where your DNS service is working have the DNS server for the non functioning subnet in its upstream list or a secondary zone for that subnet?

250.254 is my Meraki router (so no "standalone" DNS server)
Not sure if I can add a secondary zone

Does 250.254 have 235.235 in its upstream list or have a secondary zone for 235.x?

No, 250.254 doesn't have a DNS server, just services provided by the dhcp router.

I am confused. Either way, does the DNS server in the subnet where your DNS service is working have the DNS server for the non functioning subnet in its upstream list or a secondary zone for that subnet?

250.254 is my Meraki router (so no "standalone" DNS server)
Not sure if I can add a secondary zone